Thanks for the info guys... Whad would the Solas cone change do? The problam I have run into is that this prop is about an inch shorter than the other one and the drive shaft keeps slipping out of it...

You should have a rubber boot that seals the impellor on the drive side. It extends out toward the front of the prop about 3/4 inch and holds the shaft in the correct location and seals the hub on the impellor. It should not have just the oring on the drive shaft itself!!